An obtuse angle is a type of angle whose degree measurement is more than 90° but less than 180°. If two adjacent angles are complementary they form a right angle. As one acute angle and one obtuse angle can make two supplementary angles. An obtuse triangle is ___ isosceles. 5. Two right angles are always supplementary to each other. Grade 7 Maths Lines and Angles … • A right angle is equal to 90°. Solution: True. Two obtuse angles form a linear pair. Question 61. no because supplementary means when 2 angles equal 180 degrees. One of its angles is an acute angle and another angle is an obtuse angle. Solution: True Since, 90° + 90° = 180°, a supplementary angle. Take acute angle as 89 and obtuse angle as 91. (a) One obtuse angle and one acute angle (b) One reflex angle and one acute angle (c) Two obtuse angles (d) Two right angles Solution: (d) Because sum of two right angles is equal to 180°. 4. Question 62. Two angles are supplementary, if. As supplementary angle means 180 the sum total of 89 and 91 is 180. As each of the angle is $$<90^0$$.So, the sum of two acute angles is always less than $$ 180^0$$.Hence they cannot form pair of supplementary angles. Both of the angles are right angles. Two acute angles form a linear pair. ∠ PQR is an obtuse angle because its less than 180° and greater than 90°. View Full Answer Its FREE, you're just one … The angle supplementary to ∠1 is ∠6. This is the only angle marked that is acute. One obtuse angle and one acute angle can make a pair of supplementary angles. ∠1 is an obtuse angle, and any one acute angle, paired with any obtuse angle are supplementary angles. Sum of interior angles on the same side of a transversal with two parallel lines is 90°. Always. Note: • An acute angle is less than 90°. If one of the angles of a triangle is obtuse, the other two angles of a triangle must be acute. Obtuse Angle. but an acute angle is always less than 90 degrees, so two acute angles cannot add up to equal 180 degrees/be supplementary. The angle opposite to the obtuse angle is the longest side of the triangle. Answer: Yes . The bisectors of two supplementary angles are ___ perpendicular to each other. 2. Straight Angle Other resources: Angles - Problems with Solutions Types of angles Parallel lines cut by a transversal Test. Examples of obtuse angles are: 100°, 120°, 140°, 160°, 170° etc. If the sum of two angles is an obtuse angle, at least one of the angles must be ___ a. acute. An equilateral triangle cannot be obtuse. 3. Similarly, a triangle cannot have a right angle and obtuse angle at the same time. This means that ∠A + ∠B = 180°. 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